Zinc (Zn), Iron (Fe), Aluminium (Al) and Magnesium (Mg) reacts with the dilute hydrochloric acid in different test tubes. Which of the below-mentioned order of metals correctly explains the order of vigour nature of reactions.

Magnesium (Mg) > Zinc (Zn) > Iron (Fe) > Aluminium (Al)

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Magnesium (Mg) > Aluminium (Al) > Zinc (Zn) > Iron (Fe)

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Magnesium (Mg) < Aluminium (Al) < Zinc (Zn) < Iron (Fe)

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Zinc (Zn) > Aluminium (Al) > Magnesium (Mg) > Iron (Fe)

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Solution

The correct option is B
Magnesium (Mg) > Aluminium (Al) > Zinc (Zn) > Iron (Fe)

When metals react with acids they produce their respective salt and hydrogen gas.

$M e t a l A + d i l u t e H C l \to S a l t o f m e t a l A + H_{2}$

The vigour of reaction depends on the reactivity of metals. Magnesium (Mg) is more reactive than other three metals. So due to the change in reactivity, the vigour of the reaction is different.

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Q. Write word equations and then balanced equations for the reactions taking place when:
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(b) Name a metal which is so soft that it can be cut with a knife.
(c) Name the metal which is the best conductor of heat and electricity.
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(iii) Zinc with dilute hydrochloric acid
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From the metals copper, iron, magnesium, sodium and zinc, select a different metal in each case which:
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Q. Question 7
Metals generally react with dilute acids to produce hydrogen gas. Which one of the following metals does not react with dilute hydrochloric acid?

(a) magnesium
(b) aluminium
(c) iron
(d) copper

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